I intended to do a comparison of a couple of different Light Pollution filters but the weather hasn’t exactly cooperated. All I’ve got so far is 3 hours of data on M27 with a Hutech IDAS LPS-D2, my newest filter. I want to compare that as closely as possible with the older LPS-P2 to see how they differ from an imaging perspective.

3 hours (90 x 120sec) of data on a QHY168C through a Celestron EdgeHD 8″ at a focal length of 1422mm (F/7.0).